399091233 has 4 divisors (see below), whose sum is σ = 532121648. Its totient is φ = 266060820.

The previous prime is 399091229. The next prime is 399091237. The reversal of 399091233 is 332190993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (399091229) and next prime (399091237).

It is not a de Polignac number, because 399091233 - 2² = 399091229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399091191 and 399091200.

It is not an unprimeable number, because it can be changed into a prime (399091237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66515203 + ... + 66515208.

It is an arithmetic number, because the mean of its divisors is an integer number (133030412).

Almost surely, 2^399091233 is an apocalyptic number.

It is an amenable number.

399091233 is a deficient number, since it is larger than the sum of its proper divisors (133030415).

399091233 is a wasteful number, since it uses less digits than its factorization.

399091233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133030414.

The product of its (nonzero) digits is 39366, while the sum is 39.

The square root of 399091233 is about 19977.2679062979. The cubic root of 399091233 is about 736.2478889177.

The spelling of 399091233 in words is "three hundred ninety-nine million, ninety-one thousand, two hundred thirty-three".